• Proceedings of the SAREK Conference
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• 2007.11a
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• pp.64-69
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• 2007

This study is to develop heat recovery system using high performance heat pipe heat exchanger for Middle-high temperature range industrial exhaust gas. The naphthalene is used as working fluid of heat pipe in this study. Single naphthalene heat pipe could transport over 2,000 watts with $0.05^{\circ}C/W$. The heat pipe heat exchanger consist of 50 naphthalene heat pipes recovered 62 kW when over $400^{\circ}C$ gas exhausted and the maximum recovered heat rate was 173 kW in this study.

• Journal of the Korean Society for Geothermal and Hydrothermal Energy
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• v.3 no.2
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• pp.1-7
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• 2007

This paper is concerned with the selection of proper working fluids for medium temperature range heat pipe. The heat pipe which is made of SUS 316L has a total length of 700 mm as well as an outside diameter of 27.2 mm and a thickness of 2.1 mm respectively. Working fluids used in this study were Naphthalene, Biphenyl and Dowtherm A. Their charge amounts were about 40% of the inside volume of evaporator section. Experimental results shows that the Dowtherm A is good for $200^{\circ}C{\sim}300^{\circ}C$temperature range, while the Naphthalene is proper for $300^{\circ}C{\sim}430^{\circ}C$. In the case of the Naphthalene heat pipe, the heat transfer rate reaches 1500 W along with a vapor temperature of $430^{\circ}C$.